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  4. Prediction of micropollutant elimination during ozonation of a hospital wastewater effluent
 
research article

Prediction of micropollutant elimination during ozonation of a hospital wastewater effluent

Lee, Y.
•
Kovalova, L.
•
McArdell, C.S.
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2014
Water Research

Determining optimal ozone doses for organic micropollutant elimination during wastewater ozonation is challenged by the presence of a large number of structurally diverse micropollutants for varying wastewater matrice compositions. A chemical kinetics approach based on ozone and hydroxyl radical (·OH) rate constant and measurements of ozone and ·OH exposures is proposed to predict the micropollutant elimination efficiency. To further test and validate the chemical kinetics approach, the elimination efficiency of 25 micropollutants present in a hospital wastewater effluent from a pilot-scale membrane bioreactor (MBR) were determined at pH 7.0 and 8.5 in bench-scale experiments with ozone alone and ozone combined with H2O2 as a function of DOC-normalized specific ozone doses (gO3/gDOC). Furthermore, ozone and ·OH exposures, ·OH yields, and ·OH consumption rates were determined. Consistent eliminations as a function of gO3/gDOC were observed for micropollutants with similar ozone and ·OH rate constants. They could be classified into five groups having characteristic elimination patterns. By increasing the pH from 7.0 to 8.5, the elimination levels increased for the amine-containing micropollutants due to the increased apparent second-order ozone rate constants while decreased for most micropollutants due to the diminished ozone or ·OH exposures. Increased ·OH quenching by effluent organic matter and carbonate with increasing pH was responsible for the lower ·OH exposures. Upon H2O2 addition, the elimination levels of the micropollutants slightly increased at pH 7 (<8%) while decreased considerably at pH 8.5 (up to 31%). The elimination efficiencies of the selected micropollutants could be predicted based on their ozone and ·OH rate constants (predicted or taken from literature) and the determined ozone and ·OH exposures. Reasonable agreements between the measured and predicted elimination levels were found, demonstrating that the proposed chemical kinetics method can be used for a generalized prediction of micropollutant elimination during wastewater ozonation. Out of 67 analyzed micropollutants, 56 were present in the tested hospital wastewater effluent. Two-thirds of the present micropollutants were found to be ozone-reactive and efficiently eliminated at low ozone doses (e.g., >80% for gO3/gDOC = 0.5).

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Type
research article
DOI
10.1016/j.watres.2014.06.027
Web of Science ID

WOS:000341348500014

Author(s)
Lee, Y.
Kovalova, L.
McArdell, C.S.
von Gunten, U.  
Date Issued

2014

Published in
Water Research
Volume

64

Start page

134

End page

48

Subjects

Advanced oxidation process

•

Hospital wastewater

•

Micropollutant

•

Ozonation

•

Pharmaceutical

•

QSAR

Editorial or Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
LTQE  
Available on Infoscience
December 8, 2014
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/109255
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